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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23902bf96b771a5528af32930b9704ee49136ec9dc5e318bec19aa56c48d3470' 
  AND token = 'AAklB+6QA9t8FXNABHCnAXX2tuNbSAInMPw9qWIaCOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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