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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c673412e46df90a25a0159d5da1dbb9f8de80aaf64174803569d262804caa94' 
  AND token = 'P6p7YcUISW6SK9Y0spfX7UkqbB0ekgozAUyHwLkcy3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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