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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e33f724c0e6b8053438bbcb22f37e0c26b872f214d1c358321089115e7afc9e' 
  AND token = 'x4pE7KacV50uZXGtI/ibpDUApFPaegX13iJ/VvNeGbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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