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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3dd70e505c05a59c7292541b3a50c80546534c970b6620e7e642aca142beed8' 
  AND token = 'A171I7ZtSI8Tbr8typ7qGu3FlNplbPIGeh8RKNZLY+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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