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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '706c8072b1b5ac59caa0a86f88d0a6132cfeac8603aeb3ef07a4d281f2342b6f' 
  AND token = 'gS2wdFNjL+4cOmAWa+0rgl9E1sphN3N14lbp8d4iTzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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