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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '087439180f6a433eceab58fec4648a4b210197f673132904218ae3b6cb9ced81' 
  AND token = '4hXMu6IMelwL+oZzhTelNo+nfft/5jIZWyV7jnyzF+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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