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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bb12ac8f0e5389e61da4c936fecbcaef670c58978c2a36940e906ae6e0eece9' 
  AND token = 'BvjWVcLt+Ttc+rsXwbD2pcQ0++sHMIer2XLL5kwk5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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