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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '283fca6edcaecdac97cc3022d41f21fe4ad7bf85d114c70e34a4a06ded8517aa' 
  AND token = 's4Y3SddDR2SEx+OIbwEeKbcc8fA28UxkAq//t98cbBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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