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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30991d9347ffcbe61227e896ac5952bdda0ddf39c560fc79738520af168eff20' 
  AND token = 'Ww9b3skoOS4x7ozA6FjGFEjW8m90u57U3ZY/bA4lRHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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