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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beb964b9f8e270e2609679127b70bb8a9de2653e9e9664a601d4db79dcab84a6' 
  AND token = 'jDbo0rvBwuN2BY8vgDoZelo69CxzSZgeIfpeDTuFbKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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