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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01402b1e2897a0aab449f001a2a28d63cad6c1ba818aebef7bd208c5e653197' 
  AND token = '3NBazYU2gXHvbErOabIcSFNnceZwUuBu60ubleAL/Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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