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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ffac275bf3d4df813c5bef99723bfac76a9c71de0b3b501adc07e6772fdfd1b' 
  AND token = 'VeIT6iFiMxg/jJTh1DPwMJm+GesweHF98PM6osN7C04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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