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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e54fab842de52d5de970e75085cfcc77cd2f4fee50c08b0f690a72f4ffa5e594' 
  AND token = '/viDelyAiCiegVoSwxQ/BMgKs5Mv8X554ICdDkHg+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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