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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61332705c4905df32077d01f61c0e31375cf1386ab336047c2128c13e0f04c4a' 
  AND token = 'TT5xuecchQe54MhMjIS5cgaBbdmTWwzBnLOoG+ZMVGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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