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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40dc9a889db5bec0552be5d3f816ed5a99416a123def2ec031f3f61c09c58884' 
  AND token = 'e/hsv8baJx1YVonoyikU7tef0zNAmrC36VPPmsd0bjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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