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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c68a91984211ce7b9aeb66e564c625cab3084b112c36fc5c1417925e5830fef' 
  AND token = 'RG6jOasyd/vDujPCo+rnV34nIUf8aYr4+hc3dtNEKJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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