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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f7e8e1befaa3202935faeca6027e9fb2008944cdfbfc1f12ad0a052fe334260' 
  AND token = 'ZbzdM0ElVdptgD7COrnWvhAA7T4EZsIlDeCO8hjdjzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}