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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b267dabe7517d98289f67fb58e391484c2e3c88a195363fa27703f5d6f67a85' 
  AND token = 'tv+74yhwA9PsjH733ppl1/KmmuyoifFmbv5qCIea6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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