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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96a2b76f269d1c5da10412eb4c886a68cc91fff960f2189e97c3c3210e8a91e' 
  AND token = 'ni23cpZwM7hTont1Oma60gpbd7QN7EzAkMBE5UtlazE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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