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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17d30d58b6f6e76f7b56a8bbc99eeda63ade85845be7b01fcc8e2ba0b48e1126' 
  AND token = 'b8JcONR7FpwzQD0hav/BHzauIHzSQ6oPi/FFJstr4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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