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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba7f2d5ab93394565f5e91cef7b16f7da8b9a350e8e0d784a3c46c1d2885ed3e' 
  AND token = 'mzNWD/N6bvCCLepBSuUQt+d0advsJuq07A/Kam49Ixo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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