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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c51c3b0b4062ae495103d83e150c9ba6b36606ace94374b030eb094d378fcfe' 
  AND token = 'NQgci/qj6jrE5TebIdmZJJfK5mcL1CLQBAGxL94QcTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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