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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48c507cd2c6e578ca4b95d6089fb4102b9bec9e06d22e8009885821fa898f135' 
  AND token = 'I0gIzHpv6tEU8mUppYfQrHHt7ScmctsdnQbBSMCbBVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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