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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9aab3704432199ef2b2f1e3f3b05ae2deb3ec383ebe3ef978303019a3e302e4' 
  AND token = 'rMb4SqHMIuR2cNF92YgXVs/c6V64j4lEiwcurOsd6Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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