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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60ba69d9fb1d30db81d050af4df80cae303fb1f0f45d952b989822a492e736dd' 
  AND token = 'R2vh+5uPCWhsst+19ovIqe23dOsdbPUxzfsU330CwEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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