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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '415c6a5d6ff5165f90b44429cd91638c72dca97f5f2ba3f3191a70b765533310' 
  AND token = 'r2yGUCTDXmQl08q1ON/oR72Tv5vl7bRzrfTP9nyDe9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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