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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e0b02b5dde84df04fbf56730abe2e57a0c82750268e9fe122957dbf8a50f9a4' 
  AND token = 'mahvg3AMfl5QEK+NW3osSAGK8doetPJOsxHbP7kpP4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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