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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb86e3dc504a275324a9a94ad3f0474c508d8ca074c377fd74eaf5b838d24502' 
  AND token = 'Jkf8Po6m/wG8z3jJCnatfysmpB7qC6AliMrzuy1hz2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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