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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28abab77ce3b29846cefb78c1069dbe06bc6e290e4b9fcb920d2c4d1876601a' 
  AND token = 'rz4a4L6Al+x82hKBfX4o09juOW9yJvaQ5WK9c4n30eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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