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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96ed833f4faa6882033a19cf84c90f01771b015841cf9d695d2471a8b4330fa1' 
  AND token = 'vxeL76tZb5c4vBmxaVoWcEuEZopgSrm0R0AKK2A0WD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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