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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cb136b682ef416f9f438ff49cdf6a30f311bc9e1860f2dc52f8f5d2e6948a90' 
  AND token = 'nKTX0OZCT4s4oZox6y8ujEezLY95aUGnS2dY+GZfRjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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