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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f1cb87393a2d5ad2e68cf9f5f8f5d4af0a540851f9e6580e44089055e7bb298' 
  AND token = 'pOKLRkElw82ALHBE4jjmpOXGdR8CD0XwF2n3+4m4UAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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