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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc8b27e4bb64657f976b7efdf7b7a43ede2158d212201435d699b9ddcbe9d53' 
  AND token = 'rfuQE3K2e8igOhi4L2RBT65LzbYd5oO+C6XhAbfYVqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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