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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdd3378c9f033f0e725fe71f14a9b2f868541176cfeab0d9d5ebac4729df3b91' 
  AND token = 'dH5S2qdrKpDMt7jeZB20vTFRBL6UsSEAJxsx8lJMw70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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