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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5abec65aeec4cef7aafbbe82e4b102a2f308586c0cd55598d5cbe6cc5e9a2001' 
  AND token = 'R/WJi9clibmhN5Ngvs0xQEMn7uosrknGLFybpbbg7r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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