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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26026fb3ba1f1da57565af26aca5cb8848d1310b462212bd5c325fc9feb068aa' 
  AND token = 'eSmuN+Gbz7kNhve23g8Df7LC9vg/om1gTXipOouZWgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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