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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f00919aa249be04a65d0311bffeeda021936c8bdd788c811dca7a6d025a2322' 
  AND token = '70x8eBzymGnAE3DkQSSrA2R6wrzGtreun5l+560E7E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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