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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07802d18a82504539b48dbce12bb40eac6c2f2fbad368694f0fe8f931adc4d50' 
  AND token = 'URpxC0vP7wLiSxV5AbIb/hbsIFDF+kjnCTbCUqiEMvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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