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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90053a24fafb41e3afab6d2d41b08f23461bfe3f5df52e646b316f13f83a7ced' 
  AND token = 'boF+wTo1NU+NGtsOM/rhKKxi42m/3m5WwFxBpILl6mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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