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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb31a8c4b0365455bb0d263c608c510b7859587571a7b701c071d8a4d51a8b0' 
  AND token = 'dI+4eNJs/SxMgJhbJ20XRStEmb4aXmogiTZpnpjbNFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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