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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e075d1013721bd1cf01def622b055f5a85ad107b59802bb51deae1217a7d2a7' 
  AND token = '/sEnL4woQwjKs4Za6ke+ueB6fPaCw6O5k7viDBz5tyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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