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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e52b1eefc16c0956fa0207fa00d10543f29f3b0d6f36f631dda78785643ff7d' 
  AND token = 'b/fX4bOyCs3q5DjCOLcWSBsuR+1N2NhdqbDFLcKLx6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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