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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffef48d94f614ae88b124b8c2102c1780424db551acd351c1fbbf5743de874e2' 
  AND token = 'GAgxknu6+II7p+L29CLKTlB9tS9jFWyNbPsTOeKGR6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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